Justin Bieber is racking up his hip-hop collaborations. After logging studio time with T.I., Rick Ross, Diddy, Wale, and T-Pain, the pop superstar hit the studio for a late-night session with Lil Wayne.

“Me and Tunechi in the studio,” wrote the Canadian crooner, who previously collaborated with Weezy on “Backpack” for his Journals album.

After pulling an all nighter, the singer and rapper were seen exiting the Hit Factory in Miami around 6 a.m. on Friday morning. Draped in a blanket, Bieber was greeted by fans and paparazzi on his way out.

Earlier this month, the Biebs was in the lab with Birdman, working on a collaboration with Cash Money heartthrob Austin Mahone.

Soulja Boy was also spotted leaving the same studio with Atlanta rapper Diamond. He posted a pic of him and the Biebs wearing matching Giuseppe Zanotti kicks, posing in front of the $2 million Bugatti that Birdman loaned Bieber.